Sash pulley brake



SASHPULLEY BRAKE Filed April 15, 1 40 jyvurz'l'vtm FRHA/KF PRINTER M:

WILL/HM 6. SMITH Patented June 30, 1942 UNITED STATES ATET QFFICE SASH PULLEY BRAKE Frank F. Painter and William G. Smith, Tarentum, Pa., assignors to Pittsburgh Plate Glass Company, a corporation of Pennsylvania Application April 13, 1940, Serial No. 329,478

1 Claim.

The present invention relates to window constructions and more particularly to an improved type of sash pulley for use in dOllble hung sliding windows.

One object of the present invention is to provide a sash pulley which is adapted to compensate for the extra weight added to an ordinary sash when an auxiliary window is installed thereon.

Other objects and advantages of the invention will become more apparent from the following detailed description f'a preferred embodiment thereof.

Double glazed windows are now playing an important role in connection with air conditioning. Where new, complete units are installed, they may be so adjusted that the more heavily weighted sashes are easily moved. The application of an auxiliary window to the ordinary sash already in use creates another problem. It would be presumed that the substitution of a heavier sash weight for the original weight would satisfactorily solve the problem. However, the window frames are so constructed that this expedient is not practical due to lack of room, and at the same time the extra cost would be considerable.

Briefly stated, the present invention contemplates the addition of a brake to the standard sash pulley in order to retard its free rotation.

One form of the invention is shown in the accompanying drawing, wherein:

Figure 1 is a front elevational View of a double-hung window construction to which the invention is applicable; and Figure 2 is a fragmentary sectional view, on an enlarged scale, of the sash pulley brake.

Referring to the drawing, a window structure I includes a frame 2, positioned in a wall 3, and sashes 4 connected by cords 6 passing over pulleys l to sash weights 8. The weights 8 lie within the frame 2 and are approximately of a size to compensate for the weights of the sashes to which they are attached. This portion of the structure is conventional to most of the double hung sliding windows.

Our invention is concerned primarily with the sash pulleys 7 as shown in Figure 2. The pulleys 1 are secured upon horizontal axles l0 mounted within housings ll of cast metal from which extend flanges l2 which are fastened to the frame 2 by means of screws M. A metal strip I6 is secured to the bottom flange pulley housing by the screw I4 and extends inwardly of the housing. Th strip I 6 acts as a fulcrum upon which is pivoted an angular strip it, having a section l9 fitted with a block 20 of packing which contacts the pulley 1, and a section 22 which extends downwardly along the bottom flange of the pulley housing and curves outwardly to contact the sash cord 6.

When the sash cord 6 is under tension, as for example, when the weighted sash is partially raised, it presses against the section 22 of the strip l8 and raises the block 20 against the pulley, thus retarding free rotation thereof. When the sash cord 6 is not under tension, as for example, when the sash is being lifted, the block 20 is permitted to drop away from the pulley and the pulley will function in its normal manner.

It will at once be apparent that various modifications in the design of the several elements and their arrangement are possible without departing from the spirit of the invention or the scope of the appended claim.

What we claim is:

The combination with a sash pulley over which passes a sash cord, of a brake comprising an angular metal strip pivotally mounted upon a fixed fulcrum independent of the pulley, one arm of the strip movable into engagement with the pulley and the other arm contacting the sash cord so that tension upon the sash cord actuates the strip to exert a braking pressure upon the pulley.

FRANK F. PAINTER. WILLIAM G. SMITH.

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